{"product_id":"1785-l20c15-industrial-automation-module-by-allen-bradley","title":"1785-L20C15 Industrial Automation Module by Allen-Bradley","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Allen-Bradley 1785-L20C15 is a ControlNet PLC-5 processor designed for demanding industrial automation applications. As part of the PLC-5\/20C series, this module integrates local, extended, and remote I\/O into a unified control system, making it a versatile choice for process control challenges.\u003c\/p\u003e\u003cp\u003eWith an integrated ControlNet phase 1.5 interface, the 1785-L20C15 supports scheduled and unscheduled peer-to-peer communication with other ControlNet nodes. It also includes dedicated Data Highway Plus (DH+) ports and a configurable channel for DH+ or Remote I\/O, providing flexible connectivity for programming, monitoring, and real-time data exchange.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cp\u003eThe 1785-L20C15 offers a robust set of specifications that ensure reliable performance in control applications. Key parameters include:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\/Catalog No.\u003c\/td\u003e\n\u003ctd\u003e1785-L20C15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eControlNet PLC-5 Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/20C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax User Memory Words\u003c\/td\u003e\n\u003ctd\u003e16 Kilowords\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery-Backed Static RAM\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM Program Backup Option\u003c\/td\u003e\n\u003ctd\u003eYes (using 1785-ME16, -ME32, -ME64, and -M100)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtected Memory\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Total I\/O Forcible\u003c\/td\u003e\n\u003ctd\u003e512 (any mix) or 384 in + 384 out (complementary), Nonforcible 3200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Analog I\/O Forcible\u003c\/td\u003e\n\u003ctd\u003e512 and Nonforcible 32000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Scan Time Per Rack\u003c\/td\u003e\n\u003ctd\u003eControlNet I\/O 0.5 ms (average); Universal Remote I\/O 10 ms at 57.6 kbits\/s, 7 ms at 115.2 kbits\/s, 3 ms at 230.4 mbits\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Total\u003c\/td\u003e\n\u003ctd\u003e77\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Extended Local\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Universal Remote\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRS-232-C\/422-A\/423-A Ports\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Coprocessor Expansion Port\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eThe 1785-L20C15 excels in real-time, high-throughput applications. Its ControlNet interface supports controller-to-controller interlocking and real-time control of I\/O, drives, and valves. Common use cases include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eManufacturing assembly lines requiring synchronized multi-controller coordination.\u003c\/li\u003e\n\u003cli\u003eProcess control systems where remote I\/O scanning and data acquisition are critical.\u003c\/li\u003e\n\u003cli\u003eMaterial handling systems that need reliable peer-to-peer communication between PLC-5 controllers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation \u0026amp; Setup\u003c\/h2\u003e\u003cp\u003eMount the 1785-L20C15 in a suitable PLC-5 chassis. Ensure backplane power is adequate: the module draws 2.7 A at 5 V DC typically (3 A maximum). Connect ControlNet via the BNC coax connectors, and use the RJ-45 Network Access Port for temporary programming connections. Configure channel 1A for DH+ and channel 1B for either DH+ or Remote I\/O, depending on your network architecture. Always verify that all devices on the ControlNet network use the same phase (1.5) to avoid communication issues.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003eThe 1785-L20C15 uses a lithium battery for RAM backup. Periodically check the BATT indicator; replace the battery when the red LED illuminates to prevent memory loss. Keep the module clean and ensure proper ventilation to maintain heat dissipation within the 54 BTU\/hr rating. Regularly inspect cable connections and network status LEDs to ensure reliable operation.\u003c\/p\u003e\u003ch2\u003eCompatibility \u0026amp; Integration\u003c\/h2\u003e\u003cp\u003eThis processor integrates with ControlNet phase 1.5 networks and supports DH+ communication. It is compatible with other PLC-5 controllers and can act as a scanner or adapter on Remote I\/O links. The single RS-232-C\/422-A\/423-A port supports ASCII and DF1 protocols for serial communication. For program backup, install an EEPROM module (1785-ME16, -ME32, -ME64, or -M100) in the front-panel slot.\u003c\/p\u003e\u003ch2\u003eBuying Guide\u003c\/h2\u003e\u003cp\u003eBefore purchasing, confirm your system's compatibility with ControlNet phase 1.5 and verify power requirements. For a reliable supply of genuine Allen-Bradley 1785-L20C15 modules, trust PLC Source PRO. We offer quality industrial automation parts with prompt shipping.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default","offer_id":44436141047907,"sku":"1785-L20C15","price":221.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/1785-BCM_91f1d8d2-dc54-4c63-abd6-3ba5dfd153d2.jpg?v=1785793307","url":"https:\/\/www.plcsourcepro.com\/products\/1785-l20c15-industrial-automation-module-by-allen-bradley","provider":"PLC Source PRO","version":"1.0","type":"link"}